Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4327ee9d91b9986…

MALICIOUS

PDF

67.4 KB Created: 2020-08-06 13:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9df77ce285b27bc191b19c636c88dd5 SHA-1: 5d4cfec159f822d2224bf1922aa53084a12f83cb SHA-256: b4327ee9d91b998672b0b5828cebaa91bedff11d6418bfe6f0c1b7683a1c7e42
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a mass external link farm, with one link pointing to a known malicious redirector. The document body also contains a call-to-action phrase, suggesting a lure to trick the user into clicking the malicious link. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further malicious content.

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=bruhn+errata+pdf
    • http://files.salighttravel.com/uploads/1/3/1/1/131164394/ac0dc4409.pdf
    • http://files.microstatslab.ca/uploads/1/3/1/4/131437064/8436670.pdf
    • http://files.parramattagaolghosttours.com.au/uploads/1/3/1/4/131453394/zanevapoxibaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/0658/1147/files/65987408870.pdf
    • https://cdn.shopify.com/s/files/1/0431/1662/6081/files/cds_1_2020_english_paper.pdf
    • https://cdn.shopify.com/s/files/1/0430/6881/7562/files/moselojufofipolagepeva.pdf
    • https://cdn.shopify.com/s/files/1/0430/4538/8442/files/21078644297.pdf
    • https://cdn.shopify.com/s/files/1/0431/6990/6854/files/bisek.pdf
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/satemulufaroxomebasebi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71061356311.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72710717911.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4899/files/1483532752.pdf
    • https://cdn.shopify.com/s/files/1/0428/9301/7247/files/wopiterapujitenurezaduze.pdf
    • https://cdn.shopify.com/s/files/1/0438/5246/4293/files/21231686127.pdf
    • https://www.linkedin.com/pulse/training-aircraft
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caf3.bin
433e4075bdb6f51e2fe63742f97a2f9a69e5281dabd5f1469e3c6ce1297c6d14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF3 4968 bytes
font_01_sfnt_off0000dbd9.bin
50b388507ddf47a297b04d7f2b17f3bb3f6e7a32234e7776062c210c743c0e87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD9 10852 bytes

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